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Water boiling point vs pressure

Boiling point of water at different pressures

Water boiling point at vacuum pressure

Water boiling point at higher pressure

How does pressure affect the boiling point of water ?

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1. Water boiling point at vacuum pressure

2. Water boiling point Excel calculator for vacuum pressure

3. Water boiling point in pressure higher than atm

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The boiling point of water at atmospheric pressure (101315 Pa) is 100c, however the boiling point is changing with pressure, this page is giving tables and abacus to know what is the boiling point of water at different pressures.

1. Water boiling point at vacuum pressure

What is the boiling point of water at low pressure ?

When water is heated up under vacuum, its boiling point is lower than at atmospheric pressure. The boiling point at different levels of vacuum can be found out in the data table and graphs below.

Table 1 : Boiling point of water at different pressures (vacuum)

Absolute pressure [mbar abs]	Vacuum [mbar g]	Water boiling point [°C]	Water boiling point [°F]
1013.3	0	100	212
846.6	167	96	205
700.6	313	90	194
666.6	347	89	192
473.4	540	80	176
311.5	702	70	158
266.6	747	67	152
199.1	814	60	140
133.3	880	52	125
123.3	890	50	122
73.48	940	40	104
42.33	971	30	86
33.86	979	27	80
30.48	983	24	76
27.09	986	22	72
23.71	990	21	69
20.32	993	18	64
16.93	996	15	59
13.55	1000	12	53
10.16	1003	7	45
6.1	1007	0	32
3.39	1009.82	-6	21
1.69	1011.51	-14	6
1.33	1011.85	-17	1
0.67	1012.53	-24	-12
0.4	1012.87	-29	-21
0.34	1012.87	-31	-24
0.17	1013.04	-37	-35
0.13	1013.21	-40	-40
0.07	1013.21	-46	-50
0.03	1013.17	-51	-60
0.017	1013.19	-57	-70
0.003	1013.2	-68	-90

2. Water boiling point Excel calculator for vacuum pressure

You can calculate the boiling point of water from the pressure standing above the water thanks to an Excel calculator that you can download : Water Boiling point Excel calculator (click here)

Note that the calculations are based on an Antoine Law and therefore are slightly less precise than the data in the table above. It is valid for temperatures in between 0 and 100c.

Warning : this calculator is provided to illustrate the concepts mentioned in this webpage, it is not intended for detail design. It is not a commercial product, no guarantee is given on the results. Please consult a reputable designer for all detail design you may need.

3. Water boiling point in pressure higher than atm

What is the boiling point of water at high pressure ?

When water is heated up under pressure, its boiling point is higher than at atmospheric pressure. The boiling point at different levels of pressure can be found out in the data table and graphs below.

Table 2 : Boiling point of water at different pressures (pressure above atmospheric)

[bara]	[psia]	Water boiling point [°C]	Water boiling point [°F]
1.013	14.7	100	212
1.034	15	101	213
1.103	16	102	216
1.172	17	104	219
1.241	18	106	222
1.31	19	107	225
1.379	20	109	228
1.517	22	112	233
1.655	24	114	238
1.793	26	117	242
1.931	28	119	246
2.068	30	121	250
2.206	32	123	254
2.344	34	125	258
2.482	36	127	261
2.62	38	129	264
2.758	40	131	267
2.896	42	132	270
3.034	44	134	273
3.172	46	135	276
3.309	48	137	279
3.447	50	138	281
3.585	52	140	284
3.723	54	141	286
3.861	56	142	288
3.999	58	144	291
4.137	60	145	293
4.275	62	146	295
4.413	64	147	297
4.551	66	148	299
4.688	68	149	301
4.826	70	151	303
4.964	72	152	305
5.102	74	153	307
5.24	76	154	309
5.378	78	155	310
5.516	80	156	312
5.654	82	157	314
5.792	84	158	316
5.929	86	158	317
6.067	88	159	319
6.205	90	160	320
6.343	92	161	322
6.481	94	162	323
6.619	96	163	325
6.757	98	164	326
6.895	100	164	328
7.239	105	166	331
7.584	110	168	335
7.929	115	170	338
8.274	120	172	341
10.34	150	181	359
12.07	175	189	372
13.79	200	194	382
15.51	225	200	392
17.24	250	205	401
18.96	275	210	410
20.68	300	214	417
22.41	325	218	425
24.13	350	222	432
25.86	375	226	438
27.58	400	229	445
29.3	425	233	451
31.03	450	236	456
32.75	475	239	462
34.47	500	242	467
36.2	525	245	472
37.92	550	247	477
39.64	575	250	482
41.37	600	252	486
43.09	625	255	491
44.82	650	257	495
46.54	675	260	499
48.26	700	262	503
49.99	725	264	507
51.71	750	266	511
53.43	775	268	515
55.16	800	270	518
56.88	825	272	522
58.61	850	274	525
60.33	875	276	529
62.05	900	278	532
65.5	950	281	539
68.95	1000	285	545
75.06	1089	290	555
84.64	1228	298	570
98.78	1433	310	590
114.6	1662	321	610
127.9	1854	329	625
147.3	2136	341	645
163.3	2369	349	660
186.8	2710	360	680
213.5	3096	371	700
222.4	3226	374	706

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Source

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